Journal
PHYSICAL REVIEW B
Volume 78, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.201403
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Funding
- American Chemical Society [43557-AC5]
- Deutsche Forschungsgemeinschaft [SE1087/5-1]
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Using high-resolution reflection electron-energy-loss spectroscopy (HREELS), we compare experimental results for the wave-vector-dependent behavior of plasmons in a graphene sheet on SiC(0001) with that due to a filled band of surface states on semiconducting silicon. There are significant differences in behavior between the two systems and the behavior predicted for a classical two-dimensional sheet of electrons. In particular, the damping increases with wave vector independent of any obvious inelastic scattering channel. The results illustrate the importance of finite-momentum, nonlocal potential effects for the dynamical behavior of electrically isolated charge sheets.
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